In its application, MU said a number of trees would also be cut down to make way for the pumping stations.
But it said the loss would be “outweighed by the significant environmental benefits” of the scheme and would be mitigated by the further planting of trees.
The provider said the the project was an “essential infrastructure development for the island” to enhance water quality and preserve biodiversity.
The “continued discharge” of untreated sewage into the Irish Sea “must stop” and “to do nothing, is not an option”, it added.